Vibrations Associated with sinusoidal motion occur in a plane tilted towards the vertical. A wave pattern's vibration is determined by its frequency and amplitude. The sieve may move up and down or left and right. 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Alertan del peligro de que los coches sean cada vez más altos: https://www.arrowheadpride.com/users/laraknowles74